Topic on Talk:Legal Jailbait
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Totally Eighteen is that line on Ero Games/School themed hentai that say "Every character in this story is over eighteen years old/of legal consent age in the jurisdiction this game is published". Because these Japanese teenagers who in dialogue are in second year of what it seems high school are really truly 18, so you can watch them boinking without being arrested for child porn consumption, claro que sí, campeón.
Legal Jailbait is, exactly what Robkelk said, authors who like their Lust Interests underdeveloped, but because they don't want to be labelled as child pornographers they make the in story claim that the character is actually legal despite everything in their looks (and sometimes even their personality) saying otherwise.